US4028031A - Screw extruder and calender assemblage - Google Patents

Screw extruder and calender assemblage Download PDF

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Publication number
US4028031A
US4028031A US05/638,638 US63863875A US4028031A US 4028031 A US4028031 A US 4028031A US 63863875 A US63863875 A US 63863875A US 4028031 A US4028031 A US 4028031A
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US
United States
Prior art keywords
extruder
calender
chamber
rolls
assemblage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/638,638
Other languages
English (en)
Inventor
Adolf Seide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Werner and Pfleiderer GmbH
Original Assignee
Werner and Pfleiderer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Werner and Pfleiderer GmbH filed Critical Werner and Pfleiderer GmbH
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Publication of US4028031A publication Critical patent/US4028031A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/35—Extrusion nozzles or dies with rollers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/235—Calendar

Definitions

  • the present invention relates to a screw extruder-calender assemblage for producing plates and sheets or foil from pliable material, and more particularly to an assemblage of this type which is equipped with means for equalizing the effect of variations in the output of the extruder upon the output of the calender.
  • the transfer of the extruder output to the calender rolls must be continuous and with a uniform supply of material as otherwise the quality of rolled-out plates and sheets or foils is affected and thus also the results of subsequent processing of the rolled-out material.
  • the input space provided between the discharge end of the extruder and the calender rolls serves to effect a uniform transfer of material and also a uniform width of the rolled-out material. If now an increase of the extruder output occurs, the uniformity of the rolled-out material is adversely affected and there is also the danger of overloading of machinery in the assemblage by temporary pressure build up in the input space.
  • Equalization devices as now known provide means which are designed to equalize the quantities of extruded material within a given time unit.
  • a screw extruder-calender combination is provided with a flexible connection between a displaceable frame structure for the rolls and the screw extruder.
  • Such flexible connection serves to compensate by yielding possible excess pressure between the discharge end in the extruder and the input side of the calender rolls.
  • An equalization device of this type is inherently complex and thus likely to have frequent breakdowns. It is particularly disadvantageous that due to displacement of the frame structure mounting the calender rolls, the lateral limitation of the input range of the calender rolls retracts whereby the effective length of the working gap of the calender is uncontrollably enlarged. Variations in the width of the working gap results in corresponding changes in the width of the rolled-out plates and sheets or foils which in turn causes difficulties with the subsequent operations to which the output of the calender is to be subjected.
  • German patent 971,776 (DT-PS 971,776) equalization of pressure changes in the feed of material is effected by providing at lateral circularly curved cut-outs of the side walls of the discharge end of the extruder sensors which sense the rolled-out material emerging from the cut-outs.
  • the drive for devices used for further processing of the rolled-out material is controlled corresponding to sensed changes in the output.
  • Such mode of equalization has the disadvantage that a continuously irregular run is effected, not only of the extruder but also of the calender rolls. Moreover, it is necessary also to regulate the running of the devices used for further processing the rolled-out material.
  • Another object of the invention is to provide a novel and improved screw extruder-calender assemblage including pressure equalizing means of the general type above referred to in which the extruder and the calender of the assemblage are disposed in fixed positions and pressure variations are automatically compensated for by the quantity of material accumulating in an equalization chamber between the discharge end of the extruder and the input side of the calender.
  • the level of such bulge depends on the extent to which the equalization chamber is filled.
  • the upper calender roll due to its continuous rotation will continuously draw material from the bulge into the working gap thereby maintaining the total quantity of material within the equalization chamber under control.
  • the roll-shaped bulge changes its spatial position and thickness according to the variations of the extruder output very rapidly and is subjected to a continuous withdrawal over a wide layer of its surface. As a result, the feed of material to the calender rolls will not vary.
  • a particularly effective drawing of the material forming the roll-shaped bulge can be obtained by giving the equalization chamber a wedge-shaped configuration between the extruder discharge end and the calender rolls and a generally rectangular crosswise configuration as seen parallel to the rolls.
  • two equalization chambers may be provided in side-by-side position, but spaced apart and disposed within the peripheral outline of the opening in the discharge end of the extruder.
  • the invention also provides means for supervising the operational conditions of the assemblage, and more specifically, for providing sensing or probing means which are associated with the equalization chamber and continuously sense the extent of the quantity of material accumulated in the equalization chamber and effect a control of the extruder in response to such sensing.
  • a sensing means of this type can be used, for instance, for correcting misfunctioning caused by insufficient feeding of the extruder which would result in a reduction of the extruder output even though the rpm of the extruder screw remains constant.
  • FIG. 1 is a plan view of an exemplification of a screw extruder-calender assemblage according to the invention
  • FIG. 2 is a section taken on line II--II of FIG. 1;
  • FIG. 3 is a plan view similar to FIG. 1 and showing a modification of the assemblage.
  • the screw extruder-calender assemblage as exemplified comprises calender rolls 1 and 2 disposed in superimposition and parallel to each other and a screw extruder 3.
  • the material to be extruded and calendered may be a pliable synthetic plastics material.
  • Both, the calender and the screw extruder should be visualized as being of conventional design, that is, an extruder equipped with the standard accessories and screw shapes; the extruder may be a single screw extruder or a twin screw extruder.
  • the rolls of the calender are spaced to form therebetween a working gap 4.
  • the spatial arrangement of the extruder and the calender rolls is so that the extruder and the calender are spaced apart and that the extruder is disposed normal to the lengthwise axes of the calender rolls and the center axis of the extruder is in axial alignment with working gap 4.
  • the extruder has at its discharge end a discharge member or nozzle 6 including an opening 11.
  • This discharge member in conjunction with the adjacent peripheral surfaces of calender rolls 1 and 2 and curved side walls 7 and 8 define the intake range 9 for the rolls.
  • the discharge member 6 has on its side facing the intake range of rolls 1 and 4 a slanted surface 14 (see FIG. 2) which is outwardly taped from the lower end of opening 11 of discharge member 6 and extends past the upper operational range of roll 2 thereby forming equalization chambers 10 of generally wedge-shaped lengthwise configuration.
  • Two such equalization chambers are shown disposed symmetrically relative to the lengthwise axis of the extruder.
  • the height of each of the equalization chambers 10 extends above the center axis of calender roll 2.
  • excess material as caused by variations in the output of the extruder will accumulate. If there is excess of material, build-up of material in chambers 10, a roller-like bulge 12 is formed which is continuously drawn into and through gap 4 by the rotation of the upper calender roll 2 when and while the assemblage is in operation.
  • the upper calender roll 2 due to its rotation will first withdraw the excess of material present in the equalization chambers 10 by the temporary excess of the extruder output so that the quantity of material is reduced to its average and normal level.
  • FIG. 3 is similar to the assemblage shown in FIGS. 1 and 2 and described in connection therewith, except that only one equalization chamber 10 is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US05/638,638 1974-12-11 1975-12-08 Screw extruder and calender assemblage Expired - Lifetime US4028031A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2458614A DE2458614C3 (de) 1974-12-11 1974-12-11 Extruder-Kalander-Verbindung
DT2458614 1974-12-11

Publications (1)

Publication Number Publication Date
US4028031A true US4028031A (en) 1977-06-07

Family

ID=5933161

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/638,638 Expired - Lifetime US4028031A (en) 1974-12-11 1975-12-08 Screw extruder and calender assemblage

Country Status (7)

Country Link
US (1) US4028031A (cs)
CS (1) CS187329B2 (cs)
DE (1) DE2458614C3 (cs)
FR (1) FR2294039A1 (cs)
GB (1) GB1477596A (cs)
IT (1) IT1049959B (cs)
SU (1) SU619088A3 (cs)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304539A (en) * 1979-06-12 1981-12-08 Kobe Steel, Ltd. Extruder with roller die
US4813863A (en) * 1986-02-02 1989-03-21 Permian Research Corporation Rotary extruder with a gear pump
US4858139A (en) * 1987-09-08 1989-08-15 Reifenhauser Gmbh & Co. Maschinenfabrik Process and extrusion apparatus for extruding a plastic web
US4859166A (en) * 1987-08-06 1989-08-22 Kabushiki Kaisha Kobe Seiko Sho Screw extruding machine
US5225209A (en) * 1990-05-12 1993-07-06 Rheon Automatic Machinery Co., Ltd. Apparatus for stretching dough
US5443379A (en) * 1992-03-13 1995-08-22 Nestec S.A. Production of product sheets having waved marginal portions
US5607703A (en) * 1993-12-06 1997-03-04 Kabushiki Kaisha Kobe Seiko Sho Roller head extruder unit
US5639404A (en) * 1994-09-27 1997-06-17 Roehm Gmbh Chemische Fabrik Method and apparatus for preparing thermoplastic sheets, films, and plates
US20040009255A1 (en) * 2000-11-27 2004-01-15 Philippe Lamoine Extrusion device for manufacturing a product based on a rubber mix
US20150367532A1 (en) * 2013-02-15 2015-12-24 Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik Single-screw plastification machine and method for plastification of a starting material

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442128A1 (fr) * 1978-11-23 1980-06-20 Saint Gobain Procede de fabrication de feuilles de matiere plastique
AT387356B (de) * 1982-07-27 1989-01-10 Isovolta Verfahren zum herstellen von als elektroisoliermaterial geeigneten folien
FR3057197A1 (fr) 2016-10-10 2018-04-13 Compagnie Generale Des Etablissements Michelin Extrudeuse et procede d'extrusion d'un melange d'elastomeres

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382177A (en) * 1941-10-15 1945-08-14 Goodrich Co B F Apparatus for making composite strips
US3947201A (en) * 1973-12-07 1976-03-30 Usm Corporation Extruder and roll die apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382177A (en) * 1941-10-15 1945-08-14 Goodrich Co B F Apparatus for making composite strips
US3947201A (en) * 1973-12-07 1976-03-30 Usm Corporation Extruder and roll die apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304539A (en) * 1979-06-12 1981-12-08 Kobe Steel, Ltd. Extruder with roller die
US4813863A (en) * 1986-02-02 1989-03-21 Permian Research Corporation Rotary extruder with a gear pump
US4859166A (en) * 1987-08-06 1989-08-22 Kabushiki Kaisha Kobe Seiko Sho Screw extruding machine
US4858139A (en) * 1987-09-08 1989-08-15 Reifenhauser Gmbh & Co. Maschinenfabrik Process and extrusion apparatus for extruding a plastic web
US5225209A (en) * 1990-05-12 1993-07-06 Rheon Automatic Machinery Co., Ltd. Apparatus for stretching dough
US5443379A (en) * 1992-03-13 1995-08-22 Nestec S.A. Production of product sheets having waved marginal portions
US5545426A (en) * 1992-03-13 1996-08-13 Nestec S.A. Production of product sheets having waved marginal portions
US5607703A (en) * 1993-12-06 1997-03-04 Kabushiki Kaisha Kobe Seiko Sho Roller head extruder unit
US5639404A (en) * 1994-09-27 1997-06-17 Roehm Gmbh Chemische Fabrik Method and apparatus for preparing thermoplastic sheets, films, and plates
US20040009255A1 (en) * 2000-11-27 2004-01-15 Philippe Lamoine Extrusion device for manufacturing a product based on a rubber mix
US7052267B2 (en) 2000-11-27 2006-05-30 Michelin Recherche Et Technique S.A. Extrusion device for manufacturing a product based on a rubber mix
US20150367532A1 (en) * 2013-02-15 2015-12-24 Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik Single-screw plastification machine and method for plastification of a starting material

Also Published As

Publication number Publication date
DE2458614C3 (de) 1979-10-25
DE2458614B2 (de) 1979-03-01
FR2294039A1 (fr) 1976-07-09
SU619088A3 (ru) 1978-08-05
FR2294039B1 (cs) 1979-07-13
IT1049959B (it) 1981-02-10
DE2458614A1 (de) 1976-06-24
GB1477596A (en) 1977-06-22
CS187329B2 (en) 1979-01-31

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